Thankyou your absolutely right scence optimizer was on in settings no icon but when you go into a dark room it does say use night mode. But what's the point of using night mode if they both do the same thing.
I have tested this issue myself Mimo40 and have discovered that night mode is selected automatically on my S21 Ultra when using the optimizer in very low light conditions BUT better results are gained when manually selecting night mode. Relying on the optimizer gives almost a night mode lite result to me when I have used it. It uses less exposure time on occasions when I have tested the two side by side.
Indeed GoanGeek. In Photo mode it is impossible to get a quality dark looking night pictures on my S21 Ultra. Turn the optimizer off and take a picture in very low light and all you get is a muddy mess. The night mode though can give very very good and detailed but very well lit results. I don't know if Pro mode can deliver deliberately dark but clean results for those looking for this?.
Oh yeah and keep it steady maybe adjust the ISO between 500 and 800 with the shutter icon on 2 and press the circle at the top right and change it to spot, you might not get the sharpest pics this way but you should have good dark parts with low grain